* Fitch downgrade on Spain sends US stocks into slide
* Euro hits session low after rating downgrade
* Investors shed risk ahead of U.S., UK long weekends (Updates with New York midday trading)
By Albert H. Yoon
NEW YORK, May 28 (Reuters) - World equities slid and the euro fell on Friday after a downgrade of Spain's credit rating sent a new chill through markets already worried about the European debt crisis.
The downgrade by Fitch Ratings ignited a new round of selling in equities that were already lower after lackluster U.S. economic data injected a note of caution ahead of long holiday weekends in both the United States and the UK.
Fitch downgraded Spain's credit rating to AA-plus, and said it expects the country's adjustment to a lower debt level will materially reduce its rate of economic growth over the medium-term.
Fitch cited an inflexible labor market and a restructuring of of regional and local savings banks as hindrances to the pace of adjustment.
"This should exacerbate the tremendous volatility we've seen in global stocks as the world wrestles with the idea of a debt-based collapse," said Chip Hanlon, president of Delta Global Advisors in Huntington Beach, California.
"Adding to this is the fact that no one wants to be long over a holiday weekend."
The euro fell as low as $1.2284 <EUR=EBS>, according to electronic trading platform EBS, near a session of $1.2281.
The euro also dropped versus the yen <EURJPY=>, and was last down 0.9 percent at 111.59 yen.
The major U.S. stock indexes shed more than 1 percent, and U.S. Treasuries slightly extended gains, hitting session highs after the Fitch downgrade. Benchmark 10-year notes <US10YT=RR> were last up 18/32 in price, yielding 3.30 percent.
Investors had been shunning risk even before the Fitch downgrade on Spain.
A Commerce Department repor that U.S. consumer spending failed to rise in April after six straight months of gains, cast a cloud over the outlook for the consumer-driven U.S. economy. Traders were particularly cautious ahead of long holiday weekends in London and New York, and ready to step back and take profits after a strong equities rally on Thursday.
The Dow Jones industrial average <
> was down 119.94 points, or 1.17 percent, at 10,139.05. The Standard & Poor's 500 Index <.SPX> was down 15.13 points, or 1.37 percent, at 1,087.93. The Nasdaq Composite Index < > was down 32.14 points, or 1.41 percent, at 2,245.54.The S&P 500 and the Nasdaq had each fallen more than 1 percent earlier in the day, though had pared losses sharply before the news on Spain sparked a new wave of selling.
Technology bellwether Apple Inc <AAPL.O> managed to buck the downtrend, after Asian and European customers mobbed stores as the iPad tablet computer debuted outside the United States. Apple shares rose 1.5 percent. [
] Bank of America Merrill Lynch raised its price target on Apple by $25 to $325 and kept its "buy" rating.But still pressuring global shares and the euro was concern of contagion from the Greece debt crisis. Despite the lack of major shocks from Spain, Portugal or Ireland, which all have heavy debt loads, investors were still loathe to add risky assets due to questions of how shakier sovereign credit would affect the economic recovery.
Equities measured by the MSCI All-Country World Index <.MIWD00000PUS> fell 0.12 percent after earlier hitting a one-week high. The index is down about 9 percent in May and on track for its worst monthly loss since February 2009.
In Europe, markets closed ahead of the downgrade on Spain.
The pan-European FTSEurofirst 300 <
> index fell 0.3 percent, with energy shares falling along with a drop in crude oil prices."It looked quite bullish earlier, but investors are taking risk off the table going into the weekend and also holidays in the U.S. and the UK on Monday," said Matthew Brown, sales trader at ETX Capital. "They are not keen to hold equities."
Tokyo's Nikkei average <
> closed up 1.3 percent in its best one-day performance in two weeks as exporter shares climbed on a halt in the yen's advance.The Thomson Reuters/University of Michigan consumer confidence index edged higher in April, while the Institute for Supply Management-Chicago's business barometer dropped in May from a five-year high in April, signaling inventory restocking that has driven U.S. growth in recent quarters may be slowing. For details, see [
]Tempered views of global economic strength sent yields on benchmark 10-year Bunds <EU10YT=RR> down by 0.01 percentage point to 2.67 percent, and yields on 10-year U.S. Treasuries <US10YT=RR> off by 0.05 percentage points to 3.31 percent.
In energy and commodities, U.S. light sweet crude oil <CLc1> fell 1.1 percent to $73.73 per barrel, and spot gold <XAU=> fell $5.65, or 0.47 percent, to $1,205.40. (Additional reporting by Vivianne Rodrigues and Nick Olivari in New York, and Dominic Lau, Jessica Mortimer, Blaise Robinson, George Matlock and Joanne Frearson in London; Editing by Leslie Adler)